Dell Compellent SC4020 Owner's manual

Brand: Dell

Model: Compellent SC4020

Type: Owner's manual

Dell Compellent SC4020 is a powerful and versatile storage system designed to meet the demanding needs of small and medium-sized businesses. With its ability to scale up to 1.2PB of raw capacity, the SC4020 can easily handle the growing storage requirements of even the most data-intensive applications. Featuring advanced data protection features like snapshots, replication, and encryption, the SC4020 ensures that your valuable data is always safe and secure.

SC4020 Storage System

Owner’s Manual

July 2017

Rev. I

Notes, Cautions, and Warnings

NOTE: A NOTE indicates important information that helps you make better use of your product.

CAUTION: A CAUTION indicates either potential damage to hardware or loss of data and tells you how to avoid the

problem.

WARNING: A WARNING indicates a potential for property damage, personal injury, or death.

subsidiaries. Other trademarks may be trademarks of their respective owners.

About This Manual.......................................................................................................................... 5

Revision History..................................................................................................................................................................... 5

Audience................................................................................................................................................................................. 5

Contacting Dell.......................................................................................................................................................................5

Related Publications.............................................................................................................................................................. 5

1 About the SC4020 Storage System................................................................................................ 7

Storage Center Hardware Components.............................................................................................................................7

SC4020 Storage System................................................................................................................................................ 7

Switches............................................................................................................................................................................7

Expansion Enclosures...................................................................................................................................................... 7

Storage Center Architecture Options.................................................................................................................................8

Storage Center Communication.......................................................................................................................................... 9

Front-End Connectivity.................................................................................................................................................. 9

Back-End Connectivity..................................................................................................................................................10

System Administration...................................................................................................................................................10

SC4020 Storage System Hardware.................................................................................................................................. 10

SC4020 Storage System Front-Panel Features and Indicators...............................................................................10

SC4020 Storage System Back-Panel Features and Indicators.................................................................................11

SC4020 Storage System Storage Controller Features and Indicators .................................................................. 12

SC4020 Storage System Drives...................................................................................................................................17

SC4020 Storage System Drive Numbering................................................................................................................ 17

2 Replacing SC4020 Storage System Components........................................................................... 18

Safety Precautions...............................................................................................................................................................18

Electrical Safety Precautions........................................................................................................................................18

Electrostatic Discharge Precautions............................................................................................................................18

General Safety Precautions.......................................................................................................................................... 19

Pre-Replacement Procedures............................................................................................................................................ 19

Send Diagnostic Data Using Dell SupportAssist.........................................................................................................19

Contacting Dell Technical Support...............................................................................................................................19

Shut Down the Storage System...................................................................................................................................19

Replacing the Front Bezel.................................................................................................................................................. 20

Replacing Hard Drives.........................................................................................................................................................20

Hard Drive Numbering.................................................................................................................................................. 20

Identify the Failed Hard Drive....................................................................................................................................... 21

Replace a Hard Drive.....................................................................................................................................................22

Replacing Rack Rails........................................................................................................................................................... 23

Post-Replacement Procedures..........................................................................................................................................23

Start Up the Storage Controller.................................................................................................................................. 23

Send Diagnostic Data Using Dell SupportAssist........................................................................................................ 23

Contact Dell Technical Support................................................................................................................................... 24

Power Up the Storage Center Hardware.........................................................................................................................24

Contents

Contents 3

3 SC4020 Storage System Technical Specifications.........................................................................25

Technical Specifications..................................................................................................................................................... 25

4 Contents

About This Manual

This manual describes the features and technical specifications of an SC4020 storage system.

Revision History

Document Number: 680-100-001

Revision Date Description

A May 2014 Initial release

B June 2014 Removed a reference to an internal document and added additional information about

the BMC

C August 2014 Added information about iSCSI front-end connectivity support

D October 2014 Added information about SFP+ transceiver modules and contacting Dell technical

support

E November 2014 Corrected errors found during validation

F June 2015 Added information about new features for SC4020 storage systems running Storage

Center 6.6.4 or later

G December 2015 Added information about 16 Gb Fibre Channel front-end connectivity

H August 2016 Added information about 12 Gb front-end SAS connectivity

I July 2017 Removed the front-end connection instructions and added instructions for replacing

storage system components

Audience

The information provided in this manual is intended for use by Dell end users.

Contacting Dell

Dell provides several online and telephone-based support and service options. Availability varies by country and product, and some services

might not be available in your area.

To contact Dell for sales, technical support, or customer service issues, go to www.dell.com/support.

• For customized support, type your system service tag on the support page and click Submit.

• For general support, browse the product list on the support page and select your product.

Related Publications

The following documentation is available for the SC4020 Storage System.

• Dell Storage Center SC4020 Storage System Getting Started Guide

Provides information about an SC4020 storage system, such as installation instructions and technical specifications.

• Dell Storage Center Release Notes

Provides information about new features and known and resolved issues for the Storage Center software.

• Dell Storage Manager Installation Guide

Provides installation and setup instructions.

Preface

About This Manual 5

• Dell Storage Manager Administrator’s Guide

Provides instructions for using the Data Collector Manager and the Dell Storage Manager Client.

• Dell Storage Manager Release Notes

Provides information about Dell Storage Manager releases, including new features, enhancements, fixed issues, and open issues.

• Dell TechCenter

Provides technical white papers, best practice guides, and frequently asked questions about Dell Storage products. Go to http://

en.community.dell.com/techcenter/storage/.

6 About This Manual

About the SC4020 Storage System

The SC4020 storage system provides the central processing capabilities for the Storage Center Operating System and management of

RAID storage.

Topics:

• Storage Center Hardware Components

• Storage Center Architecture Options

• Storage Center Communication

• SC4020 Storage System Hardware

Storage Center Hardware Components

The Storage Center described in this document consists of an SC4020 storage system, enterprise-class switches, and expansion

enclosures.

To allow for storage expansion, the SC4020 storage system supports multiple SC200/SC220 expansion enclosuresand up to two SC280

expansion enclosures.

NOTE:

The cabling between the storage system, switches, and host servers is referred to as front‐end connectivity. The

SAS cabling between the storage system and expansion enclosures is referred to as back-end connectivity. If expansion

enclosures are not used, the SAS cabling between the storage controllers is referred to as back-end connectivity.

SC4020 Storage System

The SC4020 is a 2U storage system that supports a minimum of 7 and a maximum of 24 internal 2.5-inch hot-swappable SAS hard drives

installed horizontally side-by-side.

The SC4020 storage system contains two redundant power supply/cooling fan modules and two storage controllers with multiple I/O

ports that provide communication with servers and expansion enclosures.

Switches

Dell offers enterprise-class switches as part of the total Storage Center solution.

The SC4020 storage system supports Fibre Channel (FC) and Ethernet switches, which provide robust connectivity to servers and allow

for the use of redundant transport paths. Fibre Channel (FC) or Ethernet switches can provide connectivity to a remote Storage Center

to allow for replication of data. In addition, Ethernet switches provide connectivity to a management network to allow configuration,

administration, and management of the Storage Center.

Expansion Enclosures

Expansion enclosures allow the data storage capabilities of the SC4020 storage system to be expanded beyond the 24 internal disks in the

storage system chassis.

An SC4020 a total of 192 disks per Storage Center system. This total includes the disks in the storage system chassis and the disks in the

SC200/SC220 expansion enclosures or SC280 expansion enclosures.

An SC4020 can support:

• Up to fourteen SC200 expansion enclosures

• Up to seven SC220 expansion enclosures

• Any combination of SC200/SC220 expansion enclosures, as long as the total disk count of the system does not exceed 192

• Up to two SC280 expansion enclosures

About the SC4020 Storage System 7

NOTE: An SC4020 storage system cannot be connected to both SC200/SC220 expansion enclosures and SC280

expansion enclosures at the same time. The SC4020 supports only a single chain of SC200/SC220 expansion enclosures

or a single chain of SC280 expansion enclosures.

Storage Center Architecture Options

A Storage Center with an SC4020 storage system can be deployed in the following configurations:

• An SC4020 storage system deployed without SC200/SC220 expansion enclosures.

Figure 1. SC4020 Storage System without Expansion Enclosures

• An SC4020 storage system deployed with one or more SC200/SC220 expansion enclosures.

Figure 2. SC4020 Storage System with Two SC200/SC220 Expansion Enclosures

• An SC4020 storage system deployed with up to two SC280 expansion enclosures.

About the SC4020 Storage System

Figure 3. SC4020 Storage System with Two SC280 Expansion Enclosures

Storage Center Communication

A Storage Center uses multiple types of communication for both data transfer and administrative functions.

Storage Center communication is classified into three types: front end, back end, and system administration.

Front-End Connectivity

Front-end connectivity provides I/O paths from servers to a storage system and replication paths from one Storage Center to another

Storage Center. The SC4020 storage system provides the following types of front-end connectivity:

• Fibre Channel: Hosts, servers, or Network Attached Storage (NAS) appliances access storage by connecting to the storage system

Fibre Channel ports through one or more Fibre Channel switches. Connecting host servers directly to the storage system, without

using Fibre Channel switches, is not supported.

When replication is licensed, the SC4020 can use the front-end Fibre Channel ports to replicate data to another Storage Center.

• iSCSI: Hosts, servers, or Network Attached Storage (NAS) appliances access storage by connecting to the storage system iSCSI

ports through one or more Ethernet switches. Connecting host servers directly to the storage system, without using Ethernet

switches, is not supported.

When replication is licensed, the SC4020 can use the front-end iSCSI ports to replicate data to another Storage Center.

• SAS: Hosts or servers access storage by connecting directly to the storage system SAS ports.

NOTE:

When replication is licensed, the SC4020 can use the embedded MGMT and REPL ports to perform iSCSI

replication to another Storage Center. In addition, the SC4020 can use the embedded MGMT and REPL ports as front-

end iSCSI ports for connectivity to host servers.

About the SC4020 Storage System 9

Back-End Connectivity

Back-end connectivity refers to the SAS cabling between the storage system and expansion enclosures. If expansion enclosures are not

used, back-end connectivity refers to the SAS cabling between the storage controllers.

An SC4020 storage system supports back-end connectivity to multiple expansion enclosures.

System Administration

To perform system administration, the Storage Center communicates with computers using the Ethernet management (MGMT) port and

serial port on the storage controllers.

• Ethernet port: Used for configuration, administration, and management of Storage Center.

NOTE: The baseboard management controller (BMC) does not have a separate physical port on the SC4020. The

BMC is accessed through the same Ethernet port that is used for Storage Center configuration, administration, and

management.

• Serial port: Used for initial configuration of the storage controllers. In addition, it is used to perform support only functions when

instructed by Dell Technical Support.

NOTE: Do not throw away the serial cables that come with the SC4020. Keep the serial cables with the SC4020 for

troubleshooting purposes.

SC4020 Storage System Hardware

The SC4020 storage system ships with Dell Enterprise Plus drives, two redundant power supply/cooling fan modules, and two redundant

storage controllers.

Each storage controller contains the front-end, back-end, and management communication ports of the storage system.

SC4020 Storage System Front-Panel Features and

Indicators

The front panel of the SC4020 contains power and status indicators, a system identification button, and a unit ID display.

In addition, the hard drives are installed and removed through the front of the storage system chassis.

Figure 4. SC4020 Storage System Front-Panel View

Item

Name Icon Description

1 Power indicator Lights when the storage system power is on.

• Off – No power

• On steady green – At least one power supply is providing power to the

storage system

2 Status indicator

Lights when at least one power supply is supplying power to the storage system.

10 About the SC4020 Storage System

Item Name Icon Description

• Off – No power

• On steady blue – Power is on and firmware is running

• Blinking blue – Storage system is busy booting or updating

• On steady amber – Hardware detected fault

• Blinking amber – Software detected fault

3 Identification button Lights when the storage system identification is enabled.

• Off – Normal status

• Blinking blue – Storage system identification enabled

4 Unit ID display — Displays the storage system identification number. The default value for a new

storage system is 01.

5 Hard drives — Can have up to 24 2.5-inch SAS hard drives.

SC4020 Storage System Back-Panel Features and

Indicators

The back panel of the SC4020 contains the storage controller indicators and power supply indicators.

Figure 5. SC4020 Storage System Back-Panel View

Item

Name Icon Description

1 Power supply/cooling fan

module (PSU) (2)

— Contains a 580 W power supply and fans that provide cooling for the storage

system.

2 Battery backup unit

(BBU) (2)

— Allows the storage controller to shut down smoothly when a loss of AC power is

detected.

3 Storage controller

(2)

— Each storage controller contains:

• Back-end ports – Two 6 Gbps SAS ports

• Front-end ports – Fibre Channel ports, iSCSI ports, or SAS ports

• MGMT port – Embedded Ethernet/iSCSI port that is typically used for system

management

• REPL port – Embedded iSCSI port that is typically used for replication to

another Storage Center

• Serial port – Used for initial configuration and support functions

4 Cooling fan fault indicator

(2)

• Off – Normal operation

About the SC4020 Storage System 11

Item Name Icon Description

• Steady amber – Fan fault or the storage system is having a problem

communicating with the PSU

• Blinking amber – PSU is in programming mode

5 AC power fault indicator

(2)

• Off – Normal operation

• Steady Amber – PSU has been removed or the storage system is having a

problem communicating with the PSU

• Blinking amber – PSU is in programming mode

6 AC power status indicator

(2)

• Off – AC power is off, the power is on but the PSU is not in the storage

system, or a hardware fault is possible

• Steady green – AC power is on

• Blinking green – AC power is on and the PSU is in standby mode

7 DC power fault indicator

(2)

• Off – Normal operation

• Steady amber – PSU has been removed, a DC or other hardware fault has

occurred, or the storage system is having a problem communicating with the

PSU

• Blinking amber – PSU is in programming mode

8 Power socket (2) — Accepts a standard computer power cord.

9 Power switch (2) — Controls power for the storage system. Each PSU has one switch.

SC4020 Storage System Storage Controller Features and

Indicators

The SC4020 storage system includes two storage controllers in two interface slots.

SC4020 Storage System Storage Controller with Fibre Channel

Front-End Ports

The following figures show the features and indicators on a storage controller with Fibre Channel front-end ports.

Figure 6. SC4020 Storage System Storage Controller with Four 8 Gb Fibre Channel Front-End Ports

Figure 7. SC4020 Storage System Storage Controller with Two 16 Gb Fibre Channel Front-End Ports

About the SC4020 Storage System

Item Control/Feature Icon Description

1 Battery status indicator

• Blinking green (on 0.5 sec. / off 1.5 sec.) – Battery heartbeat

• Fast blinking green (on 0.5 sec. / off 0.5 sec.) – Battery is charging

• Steady green – Battery is ready

2 Battery fault indicator

• Off – No faults

• Blinking amber – Correctable fault detected

• Steady amber – Uncorrectable fault detected; replace battery

3 MGMT port (Slot 3/Port 1) — Ethernet/iSCSI port that is typically used for storage system management and

access to the BMC

NOTE: The MGMT port can be used as an iSCSI port for replication to

another Storage Center or as a front-end iSCSI port for connections to

host servers.

4 iSCSI port (Slot 3/Port 2) — Ethernet/iSCSI port that is typically used for replication to another Storage Center

(requires a replication license)

NOTE: The iSCSI port can be used as a front-end port for connections

to host servers.

5 SAS activity indicators — There are four SAS PHYs per SAS port.

• Off – SAS PHY is not connected

• Steady green – SAS PHY is connected, but not active

• Blinking green – SAS PHY is not connected nor active

6 Storage controller status On – Storage controller completed a power-on self-test (POST)

7 Recessed power off button Not currently used

8 Storage controller fault

• Off – No faults

• Steady amber – Firmware has detected an error

• Blinking amber – Storage controller is performing a POST

9 Recessed reset button Not currently used

10 Identification LED

• Off – Identification disabled

• Blinking blue (for 15 sec.) – Identification is enabled

• Blinking blue (continuously) – Storage controller shut down to the Advanced

Configuration and Power Interface (ACPI) S5 state

11 USB port One USB 3.0 connector

NOTE: For engineering use only.

12 Diagnostic LEDs (8) —

• Green LEDs 0–3 – Low byte hex POST code

• Green LEDs 4–7 – High byte hex POST code

13 Serial port (3.5 mm mini jack) Used to perform initial storage controller configurations. In addition, it is used to

perform support only functions when instructed by Dell Technical Support.

14 Two options:

• Four Fibre Channel ports

(Slot 1/Port 1, Slot 1/Port 2,

Slot 1/Port 3, and Slot 1/

Port 4) with three LEDs per

port

• Two Fibre Channel ports

(Slot 1/Port 1 and Slot 1/

Port 2) with three LEDs per

port

— LEDs for the four 8 Gb Fibre Channel ports:

• All off – No power

• All on – Booting up

• Blinking amber – 2 Gbps activity

• Blinking green – 4 Gbps activity

• Blinking yellow – 8 Gbps activity

• Blinking amber and yellow – Beacon

• All blinking (simultaneous) – Firmware initialized

• All blinking (alternating) – Firmware fault

About the SC4020 Storage System 13

Item Control/Feature Icon Description

LEDs for the two 16 Gb Fibre Channel ports:

• All off – No power

• All on – Booting up

• Blinking amber – 4 Gbps activity

• Blinking green – 8 Gbps activity

• Blinking yellow – 16 Gbps activity

• Blinking amber and yellow – Beacon

• All blinking (simultaneous) – Firmware initialized

• All blinking (alternating) – Firmware fault

15 Mini-SAS port B (Slot 2/Port 2) Back-end expansion port B

16 Mini-SAS port A (Slot 2/Port 1) Back-end expansion port A

SC4020 Storage System Storage Controller with iSCSI Front-End

Ports

The following figure shows the features and indicators on a storage controller with iSCSI front-end ports.

Figure 8. SC4020 Storage System Storage Controller with Two 10 GbE iSCSI Front-End Ports

Item

Control/Feature Icon Description

1 Battery status indicator

• Blinking green (on 0.5 sec. / off 1.5 sec.) – Battery heartbeat

• Fast blinking green (on 0.5 sec. / off 0.5 sec.) – Battery is charging

• Steady green – Battery is ready

2 Battery fault indicator

• Off – No faults

• Blinking amber – Correctable fault detected

• Steady amber – Uncorrectable fault detected; replace battery

3 MGMT port (Slot 3/Port 1) — Ethernet/iSCSI port that is typically used for storage system management and

access to the BMC

NOTE: The MGMT port can be used as an iSCSI port for replication to

another Storage Center or as a front-end iSCSI port for connections to

host servers.

4 REPL port (Slot 3/Port 2) — Ethernet/iSCSI port that is typically used for replication to another Storage Center

NOTE: The REPL port can be used as a front-end iSCSI port for

connections to host servers.

5 SAS activity indicators — There are four SAS PHYs per SAS port.

• Off – SAS PHY is not connected

• Steady green – SAS PHY is connected, but not active

• Blinking green – SAS PHY is not connected nor active

6 Storage controller status On – Storage controller completed a power-on self-test (POST)

14 About the SC4020 Storage System

Item Control/Feature Icon Description

7 Recessed power off button Not currently used

8 Storage controller fault

• Off – No faults

• Steady amber – Firmware has detected an error

• Blinking amber – Storage controller is performing a POST

9 Recessed reset button Not currently used

10 Identification LED

• Off – Identification disabled

• Blinking blue (for 15 sec.) – Identification is enabled

• Blinking blue (continuously) – Storage controller shut down to the Advanced

Configuration and Power Interface (ACPI) S5 state

11 USB port One USB 3.0 connector

NOTE: For engineering use only.

12 Diagnostic LEDs (8) —

• Green LEDs 0–3 – Low byte hex POST code

• Green LEDs 4–7 – High byte hex POST code

13 Serial port (3.5 mm mini jack) Used to perform initial storage controller configurations. In addition, it is used to

perform support only functions when instructed by Dell Technical Support.

14 Two iSCSI ports (Slot 1/Port 1

and Slot 1/Port 2) with one LED

per port

—

• Off – power

• Steady Amber – Link

• Blinking Green – Activity

15 Mini-SAS port B (Slot 2/Port 2) Back-end expansion port B

16 Mini-SAS port A (Slot 2/Port 1) Back-end expansion port A

SC4020 Storage System Storage Controller with Front-End SAS

Ports

The following figure shows the features and indicators on a storage controller with front-end SAS ports.

Figure 9. SC4020 Storage System Storage Controller with Four 12 Gb Front-End SAS Ports

Item

Control/Feature Icon Description

1 Battery status indicator

• Blinking green (on 0.5 sec. / off 1.5 sec.) – Battery heartbeat

• Fast blinking green (on 0.5 sec. / off 0.5 sec.) – Battery is charging

• Steady green – Battery is ready

2 Battery fault indicator

• Off – No faults

• Blinking amber – Correctable fault detected

• Steady amber – Uncorrectable fault detected; replace battery

About the SC4020 Storage System 15

Item Control/Feature Icon Description

3 MGMT port (Slot 3/Port 1) — Ethernet/iSCSI port that is typically used for storage system management and

access to the BMC

NOTE: To use the MGMT port as an iSCSI port for replication to another

Storage Center, a Flex Port license and replication license are required.

To use the MGMT port as a front-end connection to host servers, a Flex

Port license is required.

4 REPL port (Slot 3/Port 2) — Ethernet/iSCSI port that is typically used for replication to another Storage Center

NOTE: To use the RELP port as a front-end connection to host servers,

a Flex Port license is required.

5 SAS activity indicators — There are four SAS PHYs per SAS port.

• Off – SAS PHY is not connected

• Steady green – SAS PHY is connected, but not active

• Blinking green – SAS PHY is not connected nor active

6 Storage controller module

status

On – Storage controller completed a power-on self-test (POST)

7 Recessed power off button Not currently used

8 Storage controller module fault

• Off – No faults

• Steady amber – Firmware has detected an error

• Blinking amber – Storage controller is performing a POST

9 Recessed reset button Not currently used

10 Identification LED

• Off – Identification disabled

• Blinking blue (for 15 sec.) – Identification is enabled

• Blinking blue (continuously) – Storage controller shut down to the Advanced

Configuration and Power Interface (ACPI) S5 state

11 USB port One USB 3.0 connector

12 Diagnostic LEDs (8) —

• Green LEDs 0–3 – Low byte hex POST code

• Green LEDs 4–7 – High byte hex POST code

13 Serial port (3.5 mm mini jack) Not for customer use

14 Four Mini-SAS High Density

(HD) ports (Slot 1/Port 1, Slot

1/Port 2, Slot 1/Port 3, and Slot

1/Port 4)

— Front-end connectivity ports

NOTE: The mini-SAS HD ports are used for front-end connectivity only

and cannot be used for back-end expansion.

15 Mini-SAS port B (Slot 2/Port 2) Back-end expansion port B

16 Mini-SAS port A (Slot 2/Port 1) Back-end expansion port A

16 About the SC4020 Storage System

SC4020 Storage System Drives

The SC4020 storage system supports only Dell Enterprise Plus hard disk drives (HDDs) and Dell Enterprise solid-state drives (eSSDs).

Figure 10. SC4020 Storage System Drive Indicators

Item Control/Feature Indicator Code

1 Drive activity indicator

• Blinking green – Drive activity

• Steady green – Drive is detected and has no faults

2 Drive status indicator

• Off – Normal operation

• Blinking amber (on 1 sec. / off 1 sec.) – Drive identification is enabled

• Blinking amber (on 2 sec. / off 1 sec.) – Hardware/firmware fault

• Steady amber – Drive is safe to remove

SC4020 Storage System Drive Numbering

Drives are numbered from left to right in the SC4020 storage system.

The Storage Center identifies drives as XX-YY, where XX is the unit ID of the storage system, and YY is the drive position inside the

storage system.

The SC4020 holds up to 24 drives, which are numbered from left to right starting from 0.

Figure 11. SC4020 Storage Systems Drive Numbering

About the SC4020 Storage System

Replacing SC4020 Storage System

Components

This chapter describes how to remove and install components of the SC4020 storage system.

This information assumes that you have received the replacement component and are ready to install it.

Topics:

• Safety Precautions

• Pre-Replacement Procedures

• Replacing the Front Bezel

• Replacing Hard Drives

• Replacing Rack Rails

• Post-Replacement Procedures

• Power Up the Storage Center Hardware

Safety Precautions

Always follow these safety precautions to avoid personal injury and damage to Storage Center equipment.

If equipment described in this section is used in a manner not specified by Dell, the protection provided by the equipment could be

impaired. For your safety and protection, observe the rules described in the following sections.

NOTE:

See the safety and regulatory information that shipped with each Storage Center component. Warranty

information is included within this document or as a separate document.

Follow these safety precautions:

• Make sure the storage system is always fully grounded to prevent damage from electrostatic discharge.

• When handling the storage system hardware, use an electrostatic wrist guard (not included) or a similar form of protection.

• To avoid danger of the rack toppling over, slide only one chassis out of the rack at a time.

Electrical Safety Precautions

Always follow electrical safety precautions to avoid personal injury and damage to the storage system.

WARNING:

Disconnect power from the storage system when removing or installing components that are not hot-

swappable. When disconnecting power, first power down the storage system using the Dell Storage Manager Client and

then unplug the power cords from all the power supply/cooling fan modules in the storage system.

• Know the locations of the equipment power switches and the room's emergency power-off switch, disconnection switch, or electrical

outlet.

• Do not work alone when working with high voltage components.

• Do not use mats designed to decrease electrostatic discharge as protection from electrical shock. Instead, use rubber mats that have

been specifically designed as electrical insulators.

• Each power supply power cord must include a grounding prong and must be plugged into a grounded electrical outlet.

Electrostatic Discharge Precautions

Always follow electrostatic discharge (ESD) precautions to avoid injury and damage to Storage Center equipment.

Electrostatic discharge (ESD) is generated by two objects with different electrical charges coming into contact with each other. The

resulting electrical discharge can damage electronic components and printed circuit boards. Follow these guidelines to protect your

equipment from ESD:

18 Replacing SC4020 Storage System Components

• Dell recommends that you always use a static mat and static strap while working on components in the interior of the storage system

chassis.

• Observe all conventional ESD precautions when handling plug-in modules and components.

• Use a suitable ESD wrist or ankle strap.

• Avoid contact with backplane components and module connectors.

• Keep all components and printed circuit boards (PCBs) in their antistatic bags until ready for use.

General Safety Precautions

Always follow general safety precautions to avoid injury and damage to Storage Center equipment.

• Keep the area around the storage system chassis clean and free of clutter.

• Place any system components that have been removed away from the storage system chassis or on a table so that they are not in the

way of other people.

• While working on the storage system chassis, do not wear loose clothing such as neckties and unbuttoned shirt sleeves. These items

can come into contact with electrical circuits or be pulled into a cooling fan.

• Remove any jewelry or metal objects from your body. These items are excellent metal conductors that can create short circuits and

harm you if they come into contact with printed circuit boards or areas where power is present.

• Do not lift the storage system chassis by the handles of the power supply units (PSUs). They are not designed to hold the weight of

the entire chassis, and the chassis cover could become bent.

• Before moving the storage system chassis, remove the PSUs to minimize weight.

• Do not remove drives until you are ready to replace them.

NOTE: To ensure proper storage system cooling, hard drive blanks must be installed in any hard drive slot that is not

occupied.

Pre-Replacement Procedures

Perform the procedures described in this section before replacing a component of the SC4020 storage system.

Send Diagnostic Data Using Dell SupportAssist

Use Dell SupportAssist to send diagnostic data to Dell Technical Support.

Steps

1. Use the Dell Storage Manager Client to connect to the Storage Center.

2. In the Summary tab, click Send SupportAssist Information Now, which is located under SupportAssist Actions in the Status

pane.

The Send SupportAssist Information Now dialog box opens.

3. Select the Storage Center Configuration and Detailed Logs checkboxes.

4. Click OK.

Contacting Dell Technical Support

Contact Dell Technical Support to let them know that you are performing a repair.

Request that Dell Technical Support suspend alerts for the storage system and ask for a pre‐installation system check.

Shut Down the Storage System

If you are replacing the storage system chassis or rack rails, use the Dell Storage Manager Client to shut down the storage system.

Steps

1. Use the Dell Storage Manager Client to connect to the Storage Center.

2. Select Actions > System > Shut Down/Restart.

The Shut Down/Restart dialog box opens.

3. Select Shutdown from the first drop-down menu.

Replacing SC4020 Storage System Components

CAUTION: Shutting down the storage system results in a system outage.

4. Click OK.

After the storage system shuts down, unplug the power cables from the power supply/cooling fan modules.

Replacing the Front Bezel

The front bezel is a cover for the front panel of the storage system.

About this task

The front bezel must be removed from the front panel when replacing hard drives.

Steps

1. Use the system key to unlock the keylock at the left end of the bezel.

2. Lift the release latch next to the keylock.

3. Rotate the left end of the bezel away from the front panel.

4. Unhook the right end of the bezel and pull the bezel away from the storage system.

Figure 12. Replacing the Front Bezel

5. Hook the right end of the replacement bezel onto the front panel of the storage system.

6. Insert the left end of the bezel into the securing slot until the release latch locks into place.

7. Secure the bezel with the keylock.

Replacing Hard Drives

The SC4020 storage systems support hot-swappable hard drives.

The SC4020 storage system supports up to 24 2.5-inch hard drives installed vertically side by side. Hard drive blanks are installed in the

hard drive slots that do not have drives.

CAUTION:

To prevent a storage system reset, at least one powered drive must remain installed in the primary chassis

when multiple drives are replaced.

Hard Drive Numbering

The hard drives in the SC4020 storage system are numbered from left to right (0 to 23).

Figure 13. Hard Drive Numbering

Replacing SC4020 Storage System Components

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Dell Compellent SC4020 Owner's manual

Dell Compellent SC4020 Owner's manual

Dell Compellent SC4020 Owner's manual

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